Is there anyway to get a Wiring diagram for the RA8875 to an Arduino UNOI have the library downloaded and have the RA8875 connected to the 5" non-touch screenBut have NO idea how to connect this to the Arduino

Does anyone know why I would not be getting any output in the serial monitor at all? The code uploads without any errors, but there's no output... I'm using an Arduino Leonardo so I'm not sure if that effects it.

Does this need to be supplied with more power than just the 5v from the leonardo? I'm getting an output but instead of filling the screen like the code in the example buildtest says, I get stripes on the screen...

I'm having the same problem, I can actually talk to the 8875 but nothing on the screen. What's the best approach to troubleshooting the screen? This is a brand new screen from AdaFruit, arrived last night.

Screen, 8875 driver board, and Uno

UnoScreen8875.jpg (974.37 KiB) Viewed 906 times

Also, while I have the experts here, is the 8875 board 3.3v I/O tolerant? I'd love to be able run this off my Feather M0, but don't want to have to add a bunch of electronics to get all the I/O lines to 5v; I'll just use a Mega instead.

Looks OK. Can't see the ribbon cable connector in the picture. Are you sure that's solid?

It will run on 3.3V, but it's a bit flaky on my Adafruit Metro at least. I suspect that the voltage regulator isn't putting out enough current. A feather has even lower power output on 3.3V so, you'll want to power it from 5V or BAT The signal levels will still only be 3.3V, so you don't need any level shifting.

adafruit_support_rick wrote:Looks OK. Can't see the ribbon cable connector in the picture. Are you sure that's solid?

Not really, no. I did go back through the photos in the tutorial and I'm positive I have it right-side-up now. Just to be sure, I have the gold contacts on the end of the mylar ribbon facing UP when I insert it into the connector, then I close the connector by squeezing both ends of the movable bar into the body of the connector.

I get a flash from the screen when I plug in the Uno, but nothing beyond that. I don't want to RMA it if there's a way to troubleshoot and see if we can figure out if it's the screen or the module that's not working. I have a DSO at my disposal. I don't see any test points I can hit near the screen output, though.

As for your scope, you're interested in pins 30 through 33 of the 40-pin. You can probe the SMT leads. The flex cable indicates which end is pin 40

if the RA8875 is working, I believe you should see a regular pulse train on VSYNC or HSYNC. those are pins 32 and 33. I imagine you'll see lots of wiggling on PIXCLK, which is pin 30. Pin 31 is ON/OFF. Not sure about which way that one should be.

As for your scope, you're interested in pins 30 through 33 of the 40-pin. You can probe the SMT leads. The flex cable indicates which end is pin 40

if the RA8875 is working, I believe you should see a regular pulse train on VSYNC or HSYNC. those are pins 32 and 33. I imagine you'll see lots of wiggling on PIXCLK, which is pin 30. Pin 31 is ON/OFF. Not sure about which way that one should be.

Thanks! I'll look into next week, I'm on business travel most of this week. I'm wondering if it might be insufficient power, I'm just running the Uno off a PC USB port, and they're notoriously low on power. I'll get a real 5V power supply on this before breaking out the o-scope. Thanks for all the help!